Grades

Density

g/cm³

T.R.S

Mp α

Hardness

HRA

Performance &application recommended

Approx grades in China

MK4

15.1

1800

90.0

Mainly used as small buttons for percussion bits to cut soft and medium hard formations.

YG4C

MK6

14.9

2100

90.0

For coring crowns, electric coal drill bits, coal cutting picks, oil cone bits and scraping knife bits, used in geological prospecting, coal mining and oil well boring.

YG6

MK8

14.7

2400

89.5

For coring crowns, electric coal drill bits, coal cutting picks, oil cone bits and scraping knife bits, used in geological prospecting, coal mining and oil well boring.

YG8

MK10

14.7

2450

88.5

Mostly used as the buttons of small and medium sized percussion bits and as the inserts of rotary prospecting bits to cut soft and medium hard formations.

YG8C

MK15

14.6

2450

87.8

Suitable for strips, conical buttons for rotary percussion drill bits, geological prospecting buttons, cut soft and medium hard formations.

YK15

YG9C

MK20

14.4

2550

87.0

Primarily for the buttons and inserts of rotary percussion bits to cut medium-hard and hard formations.

YK20

YG10C

MK25

14.5

2600

87.5

Primarily for the buttons and inserts of rotary percussion bits to cut medium-hard and hard formations.

YK25

MK30

14.4

2600

87.0

Largely used for the inserts and buttons of percussion bits and tricone bits to cut medium-hard, hard and very hard formations.

YG11C

MK40

14.2

2650

86.5

Mainly used for the buttons of tricone bits, and inserts of rotary percussion bits to cut hard and very hard formations.

YK40

YG13C

MK50

14.0

2700

86.5

For oil cone drill bits, for medium soft and medium-hard rocks.

YG15C

MK60

14.0

2500

87.5

Good strength and less wear resistance, for bits of rotary hammer rock drills and heavy rock drills, for hard and very hard rocks.

YG15

Dimension

D

H

SR

α.

β.

6.25

9.9

3.4

20

26.5

8.25

12.2

4.4

20

26.5

9.25

13.9

5.0

20

26.5

10.25

18.9

5.5

20

27

11.30

19.0

6.0

20

27

12.35

20.9

6.6

20

28

12.35

20.0

6.3

25

24.75

13.35

19.9

7.0

20

27

14.35

22.1

7.7

20

16

14.35

24.0

7.34

25

25

16.35

24.9

8.8

20

16

19.35

30.4

9.76

20

30

21.65

31.9

11.8

20

30

Dimension

D

H

SR

e

α.

8.25

10.0

4.4

1.5

18

8.25

12.0

4.4

1.5

18

18.25

27.1

9.2

1.5

18

8.25

12.2

4.4

0.7

30

9.25

14.9

5.0

0.7

30

10.25

13.0

5.5

0.7

30

11.30

14.0

6.0

0.7

30

12.35

16.0

6.6

0.7

30

13.35

18.0

7.0

0.7

30

14.35

18.1

7.7

0.7

30

16.35

24.6

8.8

0.7

30

20.45

30.0

11.5

0.7

30

22.45

30.0

12.0

0.7

30

Dimension

D

H

SR

e

α.

13.35

13.5

7.0

1.5

18

13.35

19.9

7.0

1.5

18

14.35

20.0

7.2

3.0

18

14.35

15.0

7.5

1.7

18

16.35

19.0

8.8

2.2

18

16.35

21.9

8.8

2.2

18